Blowpipe



G. L. WALKER. I

BLOWPIPE.

APPLICATION FILED FEB. 5, 19H].

Patented July 15, 1919.

Zy4ffl2wEmoR a SMA QW 1 ATTORNEYS @TATEd GEORGE L. WALKER, 0F NEVg YORK, N. Y., ASSIGNOR TO AIR REDUCTION COMPANY, INC., A CORPORATION OF NEW YORK.

BLOWPIPE.

Specification or Letters Patent. 7 Patented July 15, 1918*.

Application filed February 5, 1919. Serial No. 275,193.

To all whom it may concern.

Be it known that I, Gnoncn L. WVALKER, residing at New York city, in the county of New York, State of New York, have invented certain new and useful Improvements in Blowpipes; and I do hereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it appcrtains to make and use thesame.

This invention relates to blowpipes employing combustible and oxidizing gases under pressure and capable of producing high temperature flames employed in vari ous heating operations.

The object generally of my invention is to provide a blowpipe structure of relatively simple character, in which interchangeable tips of varying dimensions provide for individually regulated proportioning of the gases and form with the head, When the parts are assembled, a substantially gastight joint which prevents leakage of the gases.

A further object of my invention is the provision of a blowpipe, in which the interchangeable tips are constructed to regulate the supply of one of the gases whereby a proper proportioning of the mixture is assured, without resort to ducts or passages of small diameter which may become partially closed by accumulation of deposited carbon or dirt.

Further objects and advantages of my invention will be apparent as it is better understood, by reference to the following specification when read in connection with accompanying drawing in which- Figure 1 is a longitudinal section through the head and tip of a blowpipe embodying my invention.

Fig. 2 is a section on the line 22 of Fig.1. v

Fig. 3 is a view in perspective of the tip.

Blowpipes have been heretofore constructed in which combustible gas is delivered tothe discharge passage of the tip through inlet ducts of relatively small diameter, drilled in the rear ends of the tip; Such inlet ducts are closed except at the end,

so that deposited carbon or shop dust may the mixture. This may proceed, unnoticed by the workman, until the blowpipe refuses to function, when the ducts are generally cleaned with some difficulty owing to their relatively small diameter.

I have devised a structure which provides for proper .proportioning of gases and obviates the necessity-of employing ducts of relatively small diameter, the proportioning belng nevertheless varied by the meresubstitution of a tip capable of producing a flame of the required -size. My structure,

moreover rovides a asti ht 'oint between 7 b b I] the tip and head to revent the escape of being supplied through pipes 8 and 9 from suitable sources. The passage 6 terminates at the apex of conical projecting seat 10. An annular channel 11 in the seat 10 surrounds the end of the passage 6 and the passage 7 terminates therein.

A tip 12 having a discharge passage 13 is adapted to be secured to the head 5 by means of a nut 14: and is provided at its inner end with a recessed surface conforming to the outer edge of the seat 10 and forming there with a substantially gas-tight joint. The recessed surface at the inner end of the tip 12 is countersunk adjacent the inlet to-the discharge passage and extending outwardly to theouter periphery of the channel 11, so that an annular space is provided between the seat 19 and the inner end of the tip, except at the outer edge or sealing portion of the seat. Preferably a channel 15 co5perating with the channel 11 in the head, is

formed-in the countersunk surface. 7 I

The depth of the countersunk surface is carefully designed to provide sul'licient space between such surface and the 10, to permit the passage of the desired quantity of gas from the'channel 11 to the inlet to the discharge passage 13, where it mixes with the gas issuing from the passage 6 in the head. The depth of the countersunk surface will therefore vary in tips "of different dimensions, intended to provide flames of riods. 40

varying sizes, and requiring difierent proportioning of the gases. By sin'iply removing a tip of given size and substituting another of desired size the user may employ flamesof different dimensions, the gas being automatically supplied in proper propon tions regulated by the distance between the countersunk surface and the seat 10.

As will be at once apparent, the proportioning is accomplished without employing ducts or passages capable of retaining deposited carbon or dirt. The countersunk surface may be readily'wiped clean and a glance assures the user that the blowpipe is in suitable condition to operate efficiently.

Leakage of gas and escape thereof except through the discharge assage is impossible because of the cooperation of the outer edge of the recessed surface of the tip with the corresponding portion of the conical seat 10.

The simplicity of the structure above described and the obvious ease with which it may be maintained in a highly efficient condition renders it adaptable for use by relatively unskilled workmen. Such persons may ruin blowpipe tips, of the previously known form employing closed ducts or passages for proportioning the gas delivered to the discharge passage of the tip, by inadvertently reaming and enlarging the ducts in attempting to remove accumulated dirt therefrom. With the construction herein defined, dirt does not readily accumulate and such as may appear on the countersunk surface may be simply wiped off. Tips constructed in accordance with my invention should therefore continue to give satisfactory and efficient service for indefinite pe- Various changes may be made in the form, arrangement, and construction of the parts Without departing from the spirit of the invention or sacrificing any of its material advantages, the form hereinbefore described being merely the preferred embodiment thereof.

I claim:

1. In a blowpipe the combination of a head having a seat and oxidizing and combustible gas passages terminating therein, and a tip having a discharge passage and a surface cooperating with said seat to form a gas-tight joint surrounding the ends of the oxidizing and combustible gas passages, said surface being countersunk within said joint andthere-hy spaced from said seat whereby gas from one of the passages in said head is permitted to flow to and mix with the gas issuing from the other passage in said head at the inlet to said discharge passage.

In a blowpipe the combination of a head having a projecting conical seat and oxidizing and combustible gas passages terminating therein, and a tip having a discharge passage and a recessed surface cooperating with said seat to form a gas-tight joint surrounding the ends of the oxidizing and combustible gas passages, said surface and seat being spaced within said joint whereby the gas from one of the passages in said head is permitted to flow to and mix with the gas issuing from the other passage in said head at the inlet to said discharge passage. i

3. In a blowpipe the combination of a head having a projecting conical seat and oxidizing and combustible gas passages terminating therein, and a tip having a discharge passage and a surface cooperating with said seat to form a gastight joint surrounding the ends of thefoxidizing and combustible gas passages, said surface being countersunk within said joint and thereby spaced from said seat whereby gas from one of the passages in said head is permitted to flow to and mix with the gas issuing from the other passage in said head at the inletto' said discharge passage.

et. In a blowpipe the combination of a head having oxidizing and combustible gas passages, and a seat having an annular channel therein, one of said passages terminating in said seat and the other in said channel, and a tip having a discharge passage and a surface cooperating with said seat to form a gastight joint surrounding said channel, said surface and seat being spaced between said channel and discharge passage whereby gas-from said channel and the passage terminating therein is permitted to flow to and mix with the gas issuin from the other passage in said head at the inlet to said discharge passage.

5. In a blow-pipe the combination of a head having oxidizing and combustible gas passages and a projecting conical seat having an annular channel therein, one of said passages terminating at the apex of said seat, and the other in said channeL-and'a, tip having a discharge passage alining ivith one of the gas passages in said head and. a recessed surface cooperating with said seat to form a gas-tight joint surrounding said 1 channel, said surface being countersunk Within said joint and thereby spaced from said seat" whereby gas from said channel and the passage terminating therein is permitted to flow to and mix witlrgasissuing from the said surface having a channel cooperating with the channel in said head and said seat and surface beingspaced within said channels whereby the gases from said head are permitted to mix at the inlet to said discharge passage.

7. In a blowpipe, the combination with a head having a seat and; oxidizing and cornbustible gas passages, of a tip having a surl'ace coii wrating with said seat. to form a.

gas tight joint. surrounding the ends of said passages, a discharge passage, a recess communicating with said discharge passage, means for eonveving gas from one of the passages in said head to said recess, the other passage in said head communitaiting directly with said recess and a nozzle supported on said head independently of said tip and project ing into said recess. 1

5. In a blowpipe the combination with a head having a projecting conical seat and oxnlizmg and combustible gas P tIHSQIgUS, of

;passages and a nates, of a tip having asurface cooperating with said seat to form a gas tight joint surrounding the ends of said passages, a discharge passage, and a recess communicating with said discharge passage and with the jeeting into said recess when said tip is assembled with said head.

10. In a blowpipe, the combination with a head having a projecting conical seat, oxidizing and combustible gas passages and a nozzle at the apex of said seat fonning the outlet for one of 'said passages, of a tip having a surface cooperating with said seat to form a gas tight: joint surrouinling the ends of said passages, a discharge passage, and a recess communicating with the other passage in said head, said nozzle projecting into said recess when said tip is assembled with said head. i

11. In a blowpipe, the combination with a head having oxidizing and combustible gas projecting nozzle forming the outlet from one of said passages, of a tip having a discharge passage, a "recess at its inner end embracing said nozzle, and means for maintaining a predetermined ratio of the gases flowing to said recess, said tip and head having cooperating conical surfaces to prevent the escape of gases other than through said discharge passage.

In testimony whereof I afiix my signature. I

GEORGE WALKER.

other passage in said head, said nozzle pro- 

